Roller and cage assembly

A roller and cage assembly comprising:

• a substantially cylindrical cage, having rings on both ends and a plurality of columns which are arranged integrally with each of said rings in a circumferential direction of said cage so as to define pockets parallel with said columns in an axial direction of said cage;
• and
• rollers having a diameter larger than a wall thickness of said cage, said rollers being inserted, respectively, into each of said pockets, wherein
• said columns include a substantially U-shaped recess, which extends outside a pitch circle diameter of said rollers and which has an axial length shorter than said pockets, said recess being formed at an inside portion of said columns and centered in the axial direction, and said columns further having thick-walled portions on both ends and a thin-walled portion in the center of said columns, wherein
• said thick-walled portions of said columns include outer retaining projections that are projected into said pockets to prevent said rollers from coming off outwardly, said outer retaining projections being formed by machining a portion of said columns formed thicker than a predetermined outer diameter which functions as a guide surface for an outer diameter surface of said cage after said cage is subjected to cutting, into a recess, wherein
• an outer circumferential side of said cage is subjected to cutting to remove said recess from said columns, wherein
• outer surfaces of said outer retaining projections coincide with said predetermined outer diameter which functions as said guide surface for said outer diameter surface of said cage, and wherein
• an outer surface of said columns is level with an outer circumferential surface of said rings over the entire axial length of said columns.